Which system is primarily involved in the protection of vital organs?

The skeletal system is primarily involved in the protection of vital organs. It provides a rigid framework that supports the body while also serving as a protective barrier for critical organs. For instance, the skull encases the brain, safeguarding it against injury. Similarly, the rib cage protects the heart and lungs from damage. The vertebrae surround the spinal cord, which is essential for transmitting signals between the brain and the rest of the body.

While other systems like the muscular system play important roles in movement and support, they do not primarily focus on protection. The nervous system is responsible for transmitting signals and processing information but is not directly involved in the physical protection of organs. The cardiovascular system is crucial for the circulation of blood and oxygen but does not provide structural protection. Therefore, the skeletal system's role in guarding vital organs distinguishes it as the correct choice.